半固态等温热处理对Mg-7Zn-1Cu-0.3V镁合金非枝晶组织的影响

doi:10.11896/cldb.19060165

材料导报

2020, Vol. 34

Issue (14): 14116-14121 https://doi.org/10.11896/cldb.19060165

金属与金属基复合材料

半固态等温热处理对Mg-7Zn-1Cu-0.3V镁合金非枝晶组织的影响

黄晓锋^{1, 2}, 魏浪浪¹, 杨剑桥¹, 张乔乔¹, 尚文涛¹, 李旭娇¹

1 兰州理工大学, 省部共建有色金属先进加工与再利用国家重点实验室, 兰州 730050
2 兰州理工大学, 有色金属合金及加工教育部重点实验室, 兰州 730050

Effect of Semi-Solid Isothermal Heat Treatment on Non-dendritic Structure of Mg-7Zn-1Cu-0.3V Magnesium Alloy

HUANG Xiaofeng^{1, 2}, WEI Langlang¹, YANG Jianqiao¹, ZHANG Qiaoqiao¹, SHANG Wentao¹, LI Xujiao¹

1 State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
2 Key Laboratory of Non-ferrous Metal Alloys and Processing, Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China

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摘要本工作采用半固态等温热处理法研究了保温温度和保温时间对Mg-7Zn-1Cu-0.3V镁合金半固态非枝晶组织演变的影响。结果表明:半固态等温热处理能将Mg-7Zn-1Cu-0.3V合金的原始树枝晶组织转变为半固态非枝晶组织,最终得到细小、圆整且分布均匀的球状颗粒。延长等温时间或升高保温温度有利于非枝晶组织的分离球化;但当保温温度过高或保温时间过长时,半固态颗粒会出现合并及长大现象,其主要演变符合Ostwald熟化机制。在整个等温热处理过程中,半固态组织演变主要经历了初始粗化、组织分离及球化、颗粒合并及熟化三个阶段。Mg-7Zn-1Cu-0.3V合金的最佳等温热处理工艺为:保温温度580 ℃,保温时间35 min。在该条件下得到的非枝晶颗粒平均尺寸、固相率及形状因子分别为33.25 μm、45%及1.33。

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关键词: Mg-7Zn-1Cu-0.3V镁合金半固态等温热处理非枝晶组织组织演变

Abstract: In this paper, the effects of holding temperature and holding time on the semi-solid non-dendritic microstructure evolution of Mg-7Zn-1Cu-0.3V magnesium alloy were studied by semi-solid isothermal heat treatment. The results show that the semi-solid isothermal heat treatment can transform the original dendritic structure of the Mg-7Zn-1Cu-0.3V alloy into semi-solid non-dendritic structure, and finally obtain small, round and evenly distributed spherical particles. Prolonging the isothermal time or increasing the holding temperature is beneficial to the separation and spheroidization of non-dendritic structures. However, when the holding temperature is too high or the time is too long, the semi-solid particles will merge and grow, and the main evolution mechanism is in accordance with the Ostwald ripening mechanism. During the whole isothermal heat treatment process, the semi-solid microstructure evolution mainly experienced three stages: initial coarsening, tissue separation and spheroidization, particle combination and ripening. The best isothermal heat treatment process of Mg-7Zn-1Cu-0.3V alloy is held for 35 min at the holding temperature of 580 ℃. The average size, solid phase rate and shape factor of non-dendritic particles are 33.25 μm, 45% and 1.33, respectively.

Key words: Mg-7Zn-1Cu-0.3V magnesium alloy semi-solid isothermal heat treatment non-dendritic structure microstructural evolution

出版日期: 2020-07-25 发布日期: 2020-07-14

ZTFLH:

TG146.22

基金资助: 国家自然科学基金(51464032)

作者简介: 黄晓锋,博士,副教授,研究生导师,2002年1月于哈尔滨工业大学获得博士学位,2004年5月于上海交通大学博士后出站,2004年6月进入兰州理工大学/甘肃省有色金属新材料重点实验室-省部共建国家重点实验室培育基地工作。主要从事高性能轻合金材料、轻合金半固态成形和精密塑性加工的研究工作。主持和参加省部级3项、863计划2项、先后发表文章80余篇,申请专利4项,并担任多个学术期刊的审稿人。

引用本文:

黄晓锋, 魏浪浪, 杨剑桥, 张乔乔, 尚文涛, 李旭娇. 半固态等温热处理对Mg-7Zn-1Cu-0.3V镁合金非枝晶组织的影响[J]. 材料导报, 2020, 34(14): 14116-14121.
HUANG Xiaofeng, WEI Langlang, YANG Jianqiao, ZHANG Qiaoqiao, SHANG Wentao, LI Xujiao. Effect of Semi-Solid Isothermal Heat Treatment on Non-dendritic Structure of Mg-7Zn-1Cu-0.3V Magnesium Alloy. Materials Reports, 2020, 34(14): 14116-14121.

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http://www.mater-rep.com/CN/10.11896/cldb.19060165 或 http://www.mater-rep.com/CN/Y2020/V34/I14/14116

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